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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Calculator</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #f4f4f9;
        }
        .calculator {
            background-color: #fff;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        .display {
            width: 100%;
            height: 50px;
            margin-bottom: 20px;
            background-color: #222;
            color: white;
            font-size: 2rem;
            text-align: right;
            padding: 10px;
            border-radius: 5px;
            border: none;
        }
        .buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
        }
        .buttons button {
            padding: 20px;
            font-size: 1.5rem;
            border-radius: 5px;
            background-color: #f0f0f0;
            border: 1px solid #ddd;
            cursor: pointer;
        }
        .buttons button:hover {
            background-color: #d0d0d0;
        }
        .buttons button:active {
            background-color: #b0b0b0;
        }
        .equal {
            background-color: #4CAF50;
            color: white;
        }
        .clear {
            background-color: #f44336;
            color: white;
        }
    </style>
</head>
<body>

<div class="calculator">
    <input type="text" class="display" id="display" disabled>
    <div class="buttons">
        <button onclick="appendToDisplay('7')">7</button>
        <button onclick="appendToDisplay('8')">8</button>
        <button onclick="appendToDisplay('9')">9</button>
        <button onclick="appendToDisplay('+')">+</button>
        
        <button onclick="appendToDisplay('4')">4</button>
        <button onclick="appendToDisplay('5')">5</button>
        <button onclick="appendToDisplay('6')">6</button>
        <button onclick="appendToDisplay('-')">-</button>

        <button onclick="appendToDisplay('1')">1</button>
        <button onclick="appendToDisplay('2')">2</button>
        <button onclick="appendToDisplay('3')">3</button>
        <button onclick="appendToDisplay('*')">*</button>

        <button onclick="appendToDisplay('0')">0</button>
        <button onclick="appendToDisplay('.')">.</button>
        <button onclick="clearDisplay()" class="clear">C</button>
        <button onclick="appendToDisplay('/')">/</button>
    </div>
    <button onclick="calculateResult()" class="equal">=</button>
</div>

<script>
    // Function to append the clicked button value to the display
    function appendToDisplay(value) {
        document.getElementById('display').value += value;
    }

    // Function to clear the display
    function clearDisplay() {
        document.getElementById('display').value = '';
    }

    // Function to calculate the result of the expression in the display
    function calculateResult() {
        try {
            let result = eval(document.getElementById('display').value);
            document.getElementById('display').value = result;
        } catch (error) {
            document.getElementById('display').value = 'Error';
        }
    }
</script>

</body>
</html>